Obama v Romney - battleground graphics

I don't find the graphics that the TV shows use very useful in understanding the state of play during a US Presidential election, so I thought I'd create some more useful diagrams. Please comment on my blog post and tell me what you think.

All projections come from Five Thirty Eight.

Margin bargraph

This is the most complex of the diagrams, but also potentially the most informative. Please take a moment to read the explanation below - it really should make more sense if you do :-)

Cartogram

Each state is represented by a number of circles equal to its electoral votes. Deep blue/red states with white text have been called for Obama/Romney; light blue/red states with black text are projected to go for Obama/Romney.